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JDBC连接MySQL

JDBC连接MySQL

加载及注册JDBC驱动程序

Class.forName("com.mysql.jdbc.Driver");
Class.forName("com.mysql.jdbc.Driver").newInstance();

JDBC URL 定义驱动程序与数据源之间的连接

标准语法:

<protocol(主要通讯协议)>:<subprotocol(次要通讯协议,即驱动程序名称)>:<data source identifier(数据源)>

MySQL的JDBC URL格式:

jdbc:mysql//[hostname][:port]/[dbname]["color: #0000ff">String url="jdbc:mysql://localhost:3306/sample_db";
Connection con = DriverManager.getConnection(url);

建立SQL陈述式对象(Statement Object)

Statement stmt = con.createStatement();

执行SQL语句

executeQuery()
String query = "select * from test";
ResultSet rs=stmt.executeQuery(query);
结果集ResultSet
while(rs.next())
{rs.getString(1);rs.getInt(2);}
executeUpdate()
String upd="insert into test (id,name) values(1001,xuzhaori)";
int con=stmt.executeUpdate(upd);
execute()

示例:

try
{
 }
catch(SQLException sqle)
{
}
finally
{
}

 Java类型和SQL类型 技术手册P421

PreparedStatement(预编语句)

PreparedStatement stmt = conn.prepareStatement("insert into test(id,name)values(");
stmt.setInt(1,id);
stmt.setString(2,name);

注:一旦设定语句的参数值后,就可以多次执行改语句,直到调用clearParameters()方法将他清除为止

CallableStatement(预储程序)技术手册P430

JDBC2.0使用

ResultSet对象中的光标上下自由移动
Statement stmt = con.createStatement (ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);
ResultSet rs=stmt.executeQuery("select * from test");

public Statement createStatement(int resultSetType,int resultSetConcuttency) throws SQLException

resultSetType

TYPE_FORWARD_ONLY            只能使用next()方法。
TYPE_SCROLL_SENSITIVE        可以上下移动,可以取得改变后的值。
TYPE_SCROLL_INSENSITIVE      可以上下移动。

resultSetConcuttency

CONCUR_READ_ONLY        只读
CONCUR_UPDATABLE        ResultSet对象可以执行数据库的新增、修改、和移除 

直接使用ResultSet对象执行更新数据

新增数据

Statement stmt=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_PUDATABLE);
ResultSet uprs=stmt.executeQuery("select * from test");
uprs.moveToInsertRow();
uprs.updateInt(1,1001);
uprs.updateString(2,"许召日");
uprs.insertRow;

更新数据

Statement stmt=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_PUDATABLE);
ResultSet uprs=stmt.executeQuery("select * from test");
uprs.last();
uprs.updateString("name","xuzhaori");
uprs.updateRow;

删除数据

Statement stmt=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_PUDATABLE);
ResultSet uprs=stmt.executeQuery("select * from test");
uprs.absolute(4);
uprs.deleteRow();

 批处理

con.setAutoCommit(false); 关闭自动认可模式
Statement stmt=con.createStatement();
int[] rows;
stmt.addBatch("insert into test values(1001,xuzhaori)");
stmt.addBatch("insert into test values(1002,xuyalin)");
rows=stmt.executeBatch();
con.commit(); 没有任何错误,执行批处理stmt.executeBatch();

 JNDI-数据源(Data Source)与连接池(Connection Pool)

Tomcat的JDBC数据源设置 技术手册P439

连接池工具-Proxool Var 0.8.3 技术手册P446

设置web.xml

<"1.0" encoding="ISO-8859-1"?>
<!--<"1.0" encoding="GB2312"?>-->
 
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">
….
<servlet>
<servlet-name>ServletConfigurator</servlet-name>
<servlet-class>org.logicalcobwebs.proxool.configuration.ServletConfigurator</servlet-class>
 
<init-param>
<param-name>propertyFile</param-name>
<param-value>WEB-INF/classes/Proxool.properties</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
后端统计端口添加下列
<servlet>
<servlet-name>Admin</servlet-name>
<servlet-class>org.logicalcobwebs.proxool.admin.servlet.AdminServlet</servlet-class>
</servlet>
 
<servlet-mapping>
<servlet-name>Admin</servlet-name>
<url-pattern>/Admin</url-pattern>
</servlet-mapping>
 
….
 
</web-app>

 配置Proxool.properties

jdbc-0.proxool.alias=JSPBook
jdbc-0.proxool.driver-class=com.mysql.jdbc.Driver
jdbc-0.proxool.driver-url=jdbc:mysql://localhost:3306/sample_db"htmlcode">
Connection con = DriverManager.getConnection("proxool.JSPBook");
Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
String query = "SELECT * FROM employee";
ResultSet rs = stmt.executeQuery(query);


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JDBC,连接MySQL,JDBC,Mysql链接,JDBC,链接Mysql,详解

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